seemed to be more full than they should be near the finish line. they're looking at a lot of photos. they say they just want to talk to these people. but that is the very latest that we have. they're looking at pictures of congregated groups of men to try to ask those questions. we'll be back here live at 11:00. in the meantime, though, "ac360" starts right now. >> thanks very much. [ male announcer ] purpose elevates what we do. good evening, everyone. as erin said, breaking news raises it to a more meaningful place. tonight on two fronts. late word from two federal law enforcement officials that there makes us live what we do, love what we do is an arrest in connection, as erin said, with the poison letters sent to the u.s. and fills our work with rewarding possibility. president and the u.s. senator. new developments as well in the aarp connects you to a community bombing case to tell you about. and obviously, it has been a roller coaster day for people of experienced workers here, emotionally and in terms and has tools to help you find what you're good at. of the facts of the story, it is an ally for real possibilities. not over yet. a short time ago, the fbi, aarp. go to aarp.org/possibilities. again, postponed a news briefing that was originally pushed back from the 5:00 hour. it was supposed to be then at the top of the 8:00 hour. we don't know why this has been pushed back. we hope to learn more throughout the hour. first, though, we want to check in with joe johns, on the deadly poison letter arrest.

joe, you have some news on the arrest. what are you hearing, what is the latest? >> reporter: anderson, this is an individual from tupelo, mississippi, we're told, the home state of senator roger wicker. actually, his hometown, as well. he's one of the people who got one of the mailings. we know of two suspicious letters, a lot of confusion at the united states capitol today. a mail delivery to the capitol has been stopped, while authorities try to figure all of it out. of the suspicious letters that were field tested, and initially deemed positive, one was addressed to the white house. another, an earlier letter, as i said, addressed to senator wicker. these are only field tests, false-positives are known to occur. according to law enforcement authorities, anderson, both of the letters were detected at an off site facility. authorities say there was a message contained in the letters. that message said, "to see a wrong and not expose it is to become a silent partner to its continuance."

both letters we're told signed "i'm kc and i approve this message." the letters have been sent to labs for testing. there had been ricin false-positives in the past. anderson? >> joe, last night we were told one of the letters was addressed from memphis, tennessee, postmark from memphis, tennessee. obviously, no return address on that letter. do we know how authorities were able to zero in on this particular suspect so quickly? was it somebody who had sent letters in the past and were somehow known to them? >> anderson, it's not at all clear right now, at least to us. we do know that throughout this day, authorities had suggested to some of us off the record that they may have been closing in on a suspect. so it's been clear to us for a while now that they were looking at someone, why and how we haven't been able to determine just yet. >> joe, i appreciate all of the update. now let's go to the bombing investigation here. it has been quite a day, as as we reported at the top of

my colleagues, john king and the hour, the fbi cancelled the susan candiotti, drew griffin news briefing tonight on the terror investigation after know. start with drew at the hotel postponing it earlier in the ballroom, just upstairs from us day. also, new pictures tonight from where the fbi has again delayed a slightly different angle and a press briefing. time than this one of the second drew, all day no press briefing. blast. was supposed to be this they showed the suspicious afternoon at 5:00, kept getting package in question in a pushed back and then they said 8:00. different location moved from and now we're being told likely the other photograph. not going to happen tonight. the question is, as we continue to look at these new photos what do we know why? are they telling investigators, >> reporter: we know absolutely are they significant. we frankly do not know the nothing. we've been waiting all day for answer to that question. this, as you said. and just a few minutes ago, cnn analysts, former steve mcdonald with the boston massachusetts homeland security fire department came out and announced that there will be no director with extensive press conference here. experience, obviously, investigating terror attacks that they're vacating this like this one. juliet, first of all, what do hotel, and he had no idea when you make of where things stand now and what happened? the next news conference will >> well, there's been a lot of be. he was just the messenger. cancelled press conferences. he had no explanation as to what so that doesn't happen for was going on or why or why there nothing. so you have to assume that there wasn't going to be any kind of are discussions between the news conference at all. boston police and the fbi about so we're just kind of left with what they can go forward with. speculating on what that means. and so that is basically what's are they so close they don't need the public's help? happening. so we just have to wait to see what the comfort level is in are they too far away they don't terms of what they know and have the information they want sharing with the public.

the to give to the public? and people have to understand, they don't hide things because anderson, we just don't know. they don't want you to know. there is an ongoing investigation. >> or they are just so busy they and there may be someone that don't have time to do it, which, they have targeted, that they need to get. and so part of this is just the frankly, i think for most people would be just fine, as long as it means the investigation is natural delays of any moving forward. john, let's talk about obviously investigation, and we have to be the up and down day that patient. i think it's -- >> reporters like news occurred. obviously, major conferences. miscommunication, a number of but citizens want justice. sources saying a suspect had and i think that's important. been arrested. first of all, what happened? >> the differing motivations. what are you hearing on the so every federal, state and late local agency have been in these latest? >> what i'm hearing on the latest, i believe they made rooms, wants the same thing, significant progress today, which is for justice to be based on video analysis that served and for someone to be started late last night into the found. but their motivations may be a evening and overnight. the bulk of, i'm told, came from little bit different. so boston is, you know, the surveillance cameras at the lord victimized city, the boston police want to get someone. and taylor department store, the fbi may be looking more supplementary evidence provided by a boston television station and going through even additional video. forward towards the prosecution and preserving evidence. and i'm told they are very, very there is just different motivations. settled on the fact they have one is not good and one is not identified somebody, making a bad. it's just that's why you have placement at the second different government agencies explosion site which is directly coming together to try to get across the street from the lord this person. i think the delays mean, or i and taylor. that -- they were confident know the delays mean that there about this morning. and enhanced that video where they said they had a very good

facial on a potential suspect in are advances in the the investigation. from there, there was some investigation. how far advanced is something miscommunication, and frankly, that we'll just wait for. there was misreporting. and what we all want to do is we were told by a federal ruin -- we don't want to ruin official, an arrest had been the investigation. >> and tom, obviously the public made. i received word from a boston is in a bit of a holding pattern, waiting for authorities official similar to that effect. one reported that the suspect to kind of share what had been brought to the federal information they can share. and i think people are very courthouse here in boston. understanding that there are this information coming from at some things that can be shared least, in our case, i know at and some things that cannot be cnn, sources that have been shared. where -- where do you think the trustworthy and reliable in the past. but clearly, they were not in law enforcement will come out in this case. terms of releasing the and we reported that information and were responsible for that. information, releasing whatever pictures they have to try to personally responsible for enlist the public's help? everything i say on television. you're only as good as your sources. the question is why. because yesterday they were very clear about appealing to the something was afoot today. public for help, for there are really was a break it is through, but some officials information. where do you think they are now? >> well, i think, anderson, clearly got out ahead of themselves, because we have yesterday they made that appeal governor patrick standing for help, and then in the nearby. he says one of the questions was is this a semantics breakdown, interim got help, and now they're trying to gohr a is somebody being questioned or ton of information, looking at is somebody in custody but had not been arrested, and what we the videos, hearing all of the are told tonight is no. reports they've got, interviews none of those things are true. now with witnesses and yes, they believe they have especially as some of the people identified at least one lead that were being treated in the suspect, placing at the second hospital, now have been treated site with video analysis. and can now make statements

about what they saw when they but based on what we're being told now, both publicly and my were standing next to or in front of the bomb or behind the sources privately, no one in custody. no one being questioned and no bomb. so now they're getting really one in sort of the never neverland where police sometimes information of value that they can act on. and that makes it harder, bring you and have a actually, for the commanders to conversation with you. the fact we've had no briefing take time out to go into a all day is rather curious. meeting for an hour, have a big >> so again, just to be discussion, who is going to say absolutely clear, because i what. think the word "identified i'm how much should we give, somebody", they don't -- they have no identity of the -- this how much should we release to person. they have a picture. help the public know what's is that -- going on, but at the same time, >> that's a question. not release information that that's a question. there was confidence by jeopardizes the strategy and investigators, they clearly have potential success of identifying a picture that they have and apprehending subjects in enhanced and they have somebody this case. who they believe delivered that so i think that -- i don't know, backpack to the second explosive site there. whether they have taken it to a personal observation on my the next step and they actually part, it might be time for the know the individual by name, by commanders to designate some location, that is information i information officers to come out don't know at this point. no one has said that. and maybe do a periodic briefing i was told they are very of just basic things. confident. they have identified the and not have to tie them up placement, the drop of the second explosion, explosive personally for several hours, device. but from there, our -- we're because these take a long time to prepare for, and they're just just waiting to hear more from investigators. >> susan candiotti, a lot of frankly too busy, and there are too many urgent decisions that need to be made to keep tying them up, doing these press focus on the pictures and videos. conferences.

what are you hearing? >> remember throughout the day >> tom, i keep coming back to yesterday, we were showing a the olympic park bombing, which photograph of an object of some kind and it was in front of one you were deeply involved with. they had -- because of richard of the barricades and this is before the blast. and we were trying to piece jewels' ability to actually spot together what was that. could that have been the device. the device, call over law en forssment, they had trained well, tonight we have a officers who looked at the device, got eyes on it before it brand-new photograph that was taken about an hour before that. explode and had were able to these photographs provided to us evac sate the area to some by a man who was -- whose wife degree. and that investigation still was running in the marathon, and took months, as we have talked about, even though they got eyes he was watching her. on the device before it and that's when he snapped this exploded. the difference this time around photograph. the difference being that an hour earlier, that same object, is the preponderance of cell phone cameras, the huge number who knows what it was, was of pictures and photographs of inside that barricade. this area. that is clearly the instrumental not outside, like that earlier part of this case right now. photo that we saw provided to us by a local television station >> yeah, that is one difference. the second is that that bombing here. so the question, of course, is took place at about 1:10, could that have been the bomb device. 1:15 a.m. the main camera was actually on we don't have the answer for that tonight. but it's interesting to note, cnn headquarters, pointing down into centennial park. the movement of that object. but it was still dark. however, we want to try to and once the smoke goes out, explain that at this point. it's very difficult to see >> and that object was on what's going on. and there's not as many -- the that -- in that spot, moved, all

cameras didn't have the be it, but over the course of at resolution that you have now on least an hour. your personal smartphones, and >> that's right. exactly. so now no idea from our sources, smaller cameras. and the fact that it was in checking with them, the daylight, which makes the meaning behind this. we don't know whether that's it. photography that much easier and >> so, again -- a big believer higher resolution for the in putting out there what we do amateur photographers, as wells not know. we do not know the meaning of security cameras and media this object. we don't know if it is a bag cameras. so that's one aspect. and secondly, in this case, that is germane to the jegs in they've had to take a couple any way. we don't know if this was the days to find the debris and bag because there had been reconstruct the bomb, determine reports about a black nylon bag. they had pressure cooker or in the photograph, this one does on.ther metal container, what not appear to be a black nylon bag. we've got to take a quick break. >> it doesn't look dark in firefighters coming out, talking color. who knows, it may very well be about what they saw and did to help people. one of the many, many thousands they were there when the bombs of photographs they're looking exploded. i talked to them earlier today, at and checking more closely. and why they say the boston >> in terms of where this marathon is going to be back stronger than ever, and they want to be there next year. investigation goes, obviously we'll be right back. i turned 65 last week. they are still -- or from what you're hearing, are they still poring over photographs? there must be so many photographs to go through, and if they have whittled down a time frame or believe they have, you know -- whether a person that they want to talk to, they then i would imagine have to go through, again, all of the

videos and photographs with that person in mind. >> well, clearly, with what they say and the mayor boston confirmed this to me, based on the lord and taylor video, somebody at the second site making what they believe to be the dropping of the device. the math of retirement is different today. they know what the explosion money has to last longer. took place. i don't want to pour over pie charts all day. and to so then you have a better clue in the hours and hours and i want to travel, and i want the income to do it. frames and frames of the video you have from all these surveillance cameras, television ishares incomes etfs. low cost and diversified. stations, the public is turning in, whether video or still find out why nine out of ten large professional investors photos, you have a better sense of what time frame you're looking at. choose ishares for their etfs. will they continue that, of ishares by blackrock. call 1-800-ishares for a prospectus, which includes course they will. one of the curious things, no investment objectives, risks, charges and expenses. public word today on different read and consider it carefully before investing. strategies. they have pictures of an individual they want to talk to, risk includes possible loss of principal. even as a person of interest, maybe not sure it's a suspect. do you see sometimes in investigations those things are released to the public and they say try to help us. clearly, they have not done that today. as to why, that's one of the questions you have for investigators. does that mean they have a better -- they don't need the help? we don't know. why wouldn't they do that? there have been in the past some of these things distributed among law enforcement officials. i spoke to a justice department

official a short time ago who said that based on the knowledge of that one source in washington who is very involved in the investigation, they were not aware of any distribution to law enforcement agencies, saying be on the lookout for this person or do you recognize this person. but, again, the briefing was scheduled for 1:00, moved to 5:00. then moved to 8:00. now we believe it won't happen at all tonight. why? we don't know. >> all right. from everything you're understanding, though, this -- this movement in the case is something that occurred in the evening hours to today that there has been a change since the last press conference. because the last press conference, there was a lot of talk, they were still reaching out for photographs, reaching out for the public's help. it's in the last 24 hours that this change has occurred. >> having this conversation last night, saying the sources had a very good idea of what had happened, what was in the bomb, how the bomb is constructed, when it happened, the forensics, very proud of their progress in assembling that part of it. the how and what, they were frankly stymied about the who.

overnight, they did say because of the lord and taylor video and supplementary video, they were very optimistic they were making pro on the who front including what i'm told what i'm told is a clear picture somebody they believe to make a drop of the second explosive device at the second site, near ring road, across from the lord and taylor. we have seen so many acts of now, we have that confidence, bravery here. we want to show you just a few and clearly the tone of the of those stories now. investigators became more here's randi kaye. optimistic today. the mayor of boston was quite >> reporter: right after the optimistic in a public interview first explosion, before the with me, but he said until the smoke even clears, it happens. fbi is willing to go public, we have to hold our breath. first responders at the boston but clearly the tone had marathon rush to help others. changed. but now tonight we're still waiting for information. they run towards the explosions, >> john king, i appreciate all your reporting. not away. susan candiotti, as well. >> there's got to be people hurt there are a lot of moving parts, obviously, to this out there. >> reporter: emergency personnel jump the fences, trying to reach the victims. blood everywhere. investigation. you know how up and down this limbs gone. has been. joining me now is a very busy lives ruined. man, he's about to come here, untold numbers of volunteers the governor of massachusetts, rush in to help the first responders. we may never know all of their governor deval patrick, he's names and stories. we only know they selflessly jump in to help save lives and

getting his mic on. ease the pain of the wounded in we did, as i said, anticipate a press conference at the top of any way they can. dr. vivek shaw had just crossed the 8:00 hour. but, again, that was unexpectedly stopped. the finish line when the bombs governor, how are you? went off. >> sorry for the technical >> i was running and was only 30 difficulty. >> no problems, live television. seconds away from me and there there is a lot, obviously, going were already first responders on in this investigation. there helping people. there is a lot you probably >> reporter: look at this video. cannot talk about or do not want to publicly talk about, so i'm see the woman unable to walk and not going to press you. the young girl struggling to but i do want to ask, is there carry her on her back? moments later, former new anything about the investigation that you can tell people that you want people to know. >> i can tell you and everyone england patriots' offensive that it's a thorough lineman, joe andruzzi, who was investigation, very methodical, watching the race from the and they make progress every hour and every day. but it's going to take time. finish line, rushes over and picks her up, carrying her to you know, this is a -- this is a safety. marathon runners still far from crime scene that's several the finish line are held back blocks, and they're going after the blasts. through it quarter-inch and once word spreads about the square-inch by square-inch. and building a case and explosions, many continue their following the evidence. run. this time, heading to the hospital to donate blood. and that does take time. >> how difficult -- >> everybody's patience -- there are so many volunteers, the red cross has to turn them >> how difficult is it when you have 30 different agencies, away. sending this tweet. joint terrorism task force, thanks to the generosity of people trying to work together with this enormous crime scene? >> well, it would be -- you used volunteer blood donors, there is currently enough blood on the the operative term working shelves to meet command.

together. there are a lot of agencies, every conceivable law en demand. >> so many runners who took off forssment asset at the federal, their shirts to make makeshift state and local level. but they are working in harmony and collaborating under the tourniquets. leadership of the fbi and it's making a difference. >> have you ever seen a case firefighters said they had never seen anything like what happened like this in terms of the monday. the finish line turned into a complexity of it, the complexity war zone. i spoke with some of them today. of the crime scene, the i mean, beautiful you've all multitude of photographs and evidence? >> i think they're probably all been on fire and department different. rescue squads for a long time. my experience as a prosecutor is how does it compare? old. it goes back 20 years. >> nothing like that. and when we did the attacks on >> nothing like it. the coarnage, the destruction, o black churches and synagogues in the south at that time, it was watch it, it was literally like the largest federal criminal a war zone. >> i've been a paramedic for investigation in history. we didn't have some of the -- 15-plus years on top of being a some of the investigative tools firefighter. and used to dealing with one that are used today in terms of patient, maybe multiple trauma videotape and so forth. for that one patient. but in the sense they were sifting through ash for clues, but there were several, 30 or 40 this is like that. at a time. it is very painstaking and major trauma. >> how do you know where to go? what to do? >> training. it's -- painstaking, takes small training taught us. we all collected. steps and time. so we ask for people's patience got our bearings. we spread out. and understanding.

darren, he went off like a jet. >> have you actually gone down to the scene since the bombing? he looked like -- in the "back >> it's been a crime scene, so no. they haven't wanted people to the future 2" planes chasing walking around. >> tell me a little bit about after him. this city and what you have seen i said, are you good, he said i'm good. in the seconds, the minutes, the and he went right underneath the hours after these bombings. fence and went right to work. >> what did you first see? because, i mean -- i've talked >> the first thing was just to many runners, i've talked to standing in a pool of blood when many first responders. and it just -- it is amazing the i came from under the fence and you kind of just look around to assess what is going on and who amount of people who ran toward needs help. the blast. >> isn't it? >> taking off their shirts, so i just -- wherever you could, tying tourniquets, runners just started applying taking off their shirts after tourniquets and bandages, running 26 miles. >> there have been so many of whatever ones you could. those kinds of acts of kindness luckily someone else was out there and they brought in and grace in the immediate medical bags so we could make aftermath and since. some sort of tourniquets. there were stories of people >> i heard runners were taking along the race route further up off their shirts for after they stopped the race who tourniquets. >> oh, yeah. came out of their homes and >> anything. brought runners in to recover people were -- anybody that was from the running, to help them probably in the medical field or understand what had happened, to police, fire, off duty, people connect them with their -- with their families. were just flocking to that. there have been incredible acts runners taking their shirts off, applying them as tourniquets, boston fire, ems and police did of sort of ultra professionalism a great job, unbelievable job. by medical professionals in each

of the hospitals. >> our city does a great job with -- ever since 9/11 of i visited with them. quiet acts of real kindness. training us with masteriage. we've been doing multiple drills and i appreciate your over and over again. acknowledging that and others >> how about for you? what was it like being there? acknowledging that and telling >> the training helped. those stories, because that's part of our healing, as well. the training helped 100%. >> you know, there is horror and they give you a checklist of hate and then in the wake of things to do, and it kept you that, there is compassion and focused, kept you on your kindness. >> in some ways brings out the mission. what needed to be accomplished, best in us. whatever. >> is there a particular person >> you also know the richard family. >> i do. or particular moment that stays >> martin richard, 8 years old, with any of you? one of the three lives lost in the blast. >> we had the lieutenant haines everybody who i've talked to in and i giving each other a hug at the corner of new berry and the dorchester neighborhood says they were a pillar of the exiter. and then we saw that man with community. >> they are. >> and that when people think of the slhrapnel that came out of them, they think of the richards as a unit. like all the individuals as one nowhere and his back was riddled unit. with shrapnel of some sort of it is a devastating loss. and he was on newberry street, >> well, you know, bill and the next street over. denice have been -- the mom and he was just walking wounded, basically. dad, have been active in my >> is is there time even to campaigns, and i spoke to bill think about it, as a scissor first yesterday. i had a chance to visit with them today in the hospital. i spoke with him yesterday. he reminded me of a photograph human being? or the training kicks in? he had taken of martin when he >> you shut down and go to work.

was 2 or 3 years old holding a did you guys think about campaign sign for me. anything? >> no. >> it gives you a checklist. so, you know, that whole >> a terrorist bombing -- family -- and that whole >> not until 9:00 that night. >> yeah, it's surreal. community is shattered. you don't process it. but it is a community. >> yeah, not until -- and in the sense that we in this >> shut down. city and in this state are a >> not until you watch it on the news afterwards. community. and we understand that part of you hear everybody talking about it. and it's -- you realize, that that is turning to each other you were just there. rather than on each other. and as i say, that's a part of usually after a marathon, we go how we heal. out and have a beer and burger >> governor, thank you for taking the time. and great day. nice night. governor deval patrick. first year in 27 years that i let us know what you think about was not able to go have a burger where this investigation is, afterwards. >> you want to go back. what you have been seeing. follow me on twitte >> every one of us will be back next year. every one of us. twitter @andersoncooper. if they'll have us, we'll be looking at live photos from a there. and that's why our sector runs memorial gathering nearby, the corner of boylston and berkeley, very smoothly because of the crew that i bring in. a few blocks from the bombing >> why is that so important for you to be back there next year? site. a makeshift memorial, the kind we have seen spring up so often >> because it's our thing. over the last several years. it's my thing. i've been doing it for 27 years. but each time the emotions are the exiter street and boylston fresh. the emotions are real. street has been mine for almost 22 years. and raw. people just wanting to do i've been doing medals before that. something. place a memento, place flowers, >> we're not going to let something like that stop. you're not going to let a pause and remember, even for just a few moments. terrorist act, foreign or a few seconds, paying their

domestic, something like that. we're americans, we're going to respects. no doubt that will grow in the step up and step right back into days ahead. it. you know what i mean? just ahead as governor patrick we can't let them -- that's them said, when terror came to boston winning if we don't get back into it. on monday, boston showed what it you know what i mean? i would hope the marathon goes is made of. on next year and all of the this city is standing tall. events future from here in heroes were made. boston go on. we're not going to let them win. not one asked them -- no one asked them to step up to put you know? simple as that. themselves in danger, but they did what came naturally to them. coming up, the lives they saved. >> lieutenant chris haynes, a also ahead, more on sentiment echoed by everybody in tonight's breaking news on the this city. ricin investigation, the nobody is going to let whoever dramatic hours leading up to the arrest of a suspect. did this win. we'll be right back. they're going run this race next live from boston. year, they're going to be back there next year and the year after that and the year after he can focus on his recovery. that. he doesn't have to worry so much about his mortgage, boston is strong, and boston stands tall. groceries, or even gas bills. kick! kick... we'll be right back. feel it! feel it! feel it! nice work! ♪ using telemedical and mobile technologies, you got it! you got it! yes! aflac's gonna help take care of his expenses. verizon innovators are connecting trauma surgeons and us...we're gonna get him back in fighting shape. to patients in the field. ♪ helping them get the attention they need, [ male announcer ] see what's happening behind the scenes before they even reach the hospital. at ducktherapy.com. because the world's biggest challenges

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. updating breaking news, an arrest in the ricin case. recapping two letters.

one sent to u.s. senator roger wicker, the other to president obama, each containing the same writing, the same cryptic phrase each tainted with ricin. both being tested in the army's bio warfare research lab at ft. diedrich in maryland. joe johns joining us and dana bash joining us, as well. dana, you've been talking to your sources, getting more information on how all this went down. what have you learned? >> i've learned from a law enforcement official here that they have been actually tracking the man who was arrested for some time, because he had been sending letters to senator wicker, this is not the first time. it had been going on for a while. so i'm told they gave the information that they had -- that they collected. they collected a record on this individual to the fbi, and the fbi was able then to go down to tupelo, mississippi to make this arrest of this individual today. and, again, this is -- this man was arrested in the case of sending what they still believe to be at least initial positive tests of ricin, letters to

senator roger wicker of mississippi and also we learned today president obama. neither of those letters, of course, got to either individual. they were both found at offsite locations where the mail is initially sorted. >> so clearly -- so they knew this guy. they had been following him before, or at least aware of his presence. and that's how they were able to move so quickly. >> so quickly. i mean, you know, when you think about it -- we just found out about this 24 hours ago or so, and that's exactly right. they had already had a record built up of him. they had been following him, monitoring the correspondence he was sending to senator wicker and that's they were able to find him and give the information to the fbi and move so fast. that's exactly right. >> joe in terms of the investigation, where do we stand as to whether or not this is, in fact, the ricin? >> they don't have conclusive results, anderson. the way this works, you do a field test, if you get a hit positive, you send it off to a

lab such as ft. diedrich in maryland. and then they do more careful tests. and as soon as they find out anything conclusive, they release that information. of course, that information is very much wanted on capitol hill, and in other places to find out how serious this is, even though the letter actually didn't get to the capitol. so the point is, they're -- they don't have a conclusive test yet. they don't have conclusive information. it could be 24, it could be 48 hours. one source told me today, it could take as long as a week to make absolutely certain whether this stuff is ricin or not, anderson. >> and dana, is mail still halted -- i know mail had been temporarily halted to the capitol. >> it is. and they're not going to get mail again until monday. this is something that was -- was -- members of the senate and their staff was informed about this by the senate sergeant-at-arms earlier today. i just want to -- as i'm talking

to you, i just got on my e-mail, anderson, another notice that the senate sergeant-at-arms sent out to the entire senate complex. and in it, it was just talking about a lot of the events that have happened. and it included in here something that we heard rumblings. but this is now confirmed. yesterday a man with a gun was captured on the east front of the capitol. a man with a gun was captured on the east front of the capitol. and the reason this is in this notice, it's listing that, of course -- this ricin event and some other suspicious packages that made parts of the capitol complex in lockdown today as a whole bunch of things that showed that the capitol police is on these events. but also to make people -- remind people they need to be aware of their surroundings and to really be vigilant, not just with the mail they get, but everything around them. >> yeah. dana, appreciate that. joe johns, as well. joining me now is 360 md sanjay

gupta. last night we talked about trauma surgery. tonight ricin poisoning. if it's not one thing, it's another. what should we know about ricin? it's -- it's something that occurs in nature. but how is it made? >> you know, we hear about castor oil and that's something that's been around for a long time. you take this from a particular type of plant. and this is a protein from that plant. so you're right. it's something that does occur in nature. but it's very hard to quote, unquote, weaponize. the last time we talked about something like this quite a bit was with anthrax, which is also difficult to weaponize. just to give you an idea, you're talking about trying to make it into spores or particles the size of something that would come out of a asthma inhaler. and even if you make the particles that small, they will stick to each other in an envelope unless you coat them. that's more than you need to know. but the point is, this is not a rudimentary process. people watch the show "breaking bad" will no doubt heard of ricin, because walter white manufacturers it on that.

>> he's a chemist. >> but how unstable a property is it? how dangerous is it to handle it and how does it actually kill somebody or hurt somebody? >> if you inhale it, if you ingest it, those are the two most common ways. so inhaling it again means -- it can take a very small amount. 1/1000 of a graham, but it has to be the size that can reach the airways in your lungs. if you put it in your hands and on your fingers, it will start to be de nature and become unstable. but the idea of touching your tongue and becoming poison, it can happen but unlikely. it would almost be more of a situation of someone actually licking the envelope to seal it shut. that would be more of a risk to them. >> and then is it possible for it to spread to other envelopes? if it's in a bin of mail or something like that? >> it can. it certainly can. but when it starts -- when human hands start touching it, that's what renters it more unstable

and as you disseminate it more and more, it takes very small amounts to be poisonous or a problem, but it would be unlikely to spread that way. i will tell you, it's something we have known about for some time. and the way that ricin works, unlike anthrax, which is a bacteria that has spores, ricin gets into cells and kills the cells directly. in fact, it was one time thought of something that could be used to treat cancer, that's how effective it is in killing cells. but i just think it's unlikely to cause significant problems. >> sanjay, appreciate the reporting on that. good to know. coming up, so many people sustained serious, life-changing injuries in the bombing. i'll speak with a woman whose two brothers each lost legs. and a man with vision loss after getting shrapnel taken out of his head. and so many inspiring stories of heroism in the face of the trauma. we'll look at some of the stories, the kind that really restore your faith in humanity. coming up. [ female announcer ] does your vibrant color

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in the olympic marathon -- >> new video. another perspective, another angle on the destruction at the finish line. the attack in boston has not broken the spirit of this city. not by a long shot. but there is no denying for so many people their lives have been changed forever. the kind of injuries that many are now trying to recover from are hard to imagine. caitl caitlyn nordin joins me, and steve burn. thank you so much for being with

us. first of all, how are your brothers doing? >> they're hanging in there. >> you weren't there, you had come down -- >> i was working in boston thenway. >> where were they in relation to the blast? >> they were at the second bomb, like right on top of it. >> fwns. and steve, how are you doing? you just left the hospital last night. >> glad to be out and compared to how my friends are, it's -- as bad as it is, i can't complain. i was six inches away from being the same way as them, losing limbs and stuff like that. i just was fortunate enough to have the mailbox take most of the impact from the lower half of my body and the rest of the shrapnel, anything above the height of the mailbox is what caught in the face, neck. >> so where were you -- this is in relation to the first explosion. >> we were at the second, yes. and there was -- right where you see the picture where they show the backpack and mailbox, that's exactly where we were. >> so you were -- if you're facing the mailbox, you're to the right of it.

just . >> just to the left of it. they were to the right of it and that's why they suffered --. so the shrapnel that hit you is shrapnel that came over the mailbox? >> bee-bees, nails. my friend had 70 nails in his leg. >> 70 nails. >> 70 nails. and i had bee-bees, still one in my neck the doctors couldn't take out because it's too close to the nerves that control my vision. and most of them in my face came out due to the surgery and stuff like that. and just burns. burnt the clothes right off of us. >> your clothes were burned off. >> burned off of us. undescribable. >> do you remember the blast? >> i remember everything about it. >> really? >> yep. >> can you walk me through? what stands out? >> the first explosion went off, just down the block from us. and -- >> did you know something was wrong then? >> we knew it wasn't something to do with the marathon and we were ready to get going and get out of there. and our friend, jared, said let's get the girls over the

fence. and just as he said that is when the explosion hit. it blew me over the fence into the street and stuff. >> it actually carried you over. >> it carried me over, and the force and the heat and the burn from the chemicals in the bomb were just -- had me on fire and everyone else. and as i came through, just in the days of what was going on, just looking for my friends and stuff like that, and -- it's -- it was just absolute chaos. i saw things that, you know -- i wish i didn't see. people losing limbs and just stuff -- it was bad. >> could you hear anything after the explosion -- i talked to some people who said they couldn't hear anything. they could see people's lips moving -- >> it was like in the movie "the town" when the flash grenade went off and all you could hear is that high-pitch noise. that's all it was. and it's like it was in slow-motion, just seeing what was going on. but half the people ran away and the other half of the people ran to help. so it was -- it was amazing to see the amount of people that stood by to help us out and just -- it was catastrophic, just to know what was going on and not knowing where anyone i

came with -- four out of my five friends lost their limbs. >> four out of your five friends. >> yeah. we're all very close friends. her two brothers. i know the family well. and they're like brothers to me. i love them to death. and i just -- i wish the best to everybody. our friend mark, he lost both of his legs. most likely. >> no. one. >> border line with that. and just pray to god he pulls through and just -- having a great day, and waiting to see our friend cross the finish line and then all of a sudden just it turned in a flash. >> do you know how long your brother is going to have to be in the hospital for? >> one of my brothers is, like, coherent now and talking. he's off the ventilator. the other one is not. >> still on a ventilator. >> yeah. so he's actually in surgery right now. >> and they're in separate hospitals. >> one is at beth israel and one at brigham. >> i understand your brothers keep asking about each ear. >> that's all they're asking. >> how is your family doing? >> surprisingly, my mom is

holding up. and she is a trouper, because i don't know, i couldn't do it. so -- going back and forth. and she wants to be at one and wants to be at the other. and she is doing it, though so -- >> caitlyn, i'm so sorry for what your family is going through. please give our best wishes. and glad you're doing okay. >> appreciate it. thank you very much. >> sorry to hear about all of your friends. >> just hoping that everyone sticks by everybody for the bills. we're all self-employed. and no one -- there's just -- everyone is concerned with the medical bills. and that's -- phenomenal that people are willing to step up and help us with that. but people forget, too, that our friend jerryd is a carpenter, both his hands are incinerated. the bills keep coming in, and stuff. and people don't realize that. it's not just the hospitals, it's everyday life that doesn't stop. >> so how is that working? are you paying your own hospital bills? or is there -- how does that work right now? >> we've heard numerous things from people that, you know, so-and-so will help pay or this will help pay or there's foundations for this. fund raisers have been set up for us for everybody affected,

not just us, but to help with the medical bills. >> especially with those who have lost limbs. i mean, i was talking to a guy with prosthetic devices today. those can cost $50,000. >> people are reaching out, though. >> they are. >> yeah. they have been -- yeah. it's -- support is tremendous. >> yeah. >> we're just hoping that, you know, the mayor, the governor, president obama, that they don't less us as citizens down, the united states of america. we're hard-working people, and in a time of need with a terrorist act on american soil, we're just really hoping our country steps up for us and that they're there and not one person affected by this catastrophic event has to deal with the burdens of financial problems afterward. >> yeah. >> not to mention with the physical things they have to live their life with now. >> sure. we're going to put all of the information on our website for how people can help, and obviously that's going to get more sorted out in the days ahead. so we're going to continue on that, keep on updating that website. >> excellent. thank you very much. appreciate it.

>> careful. stay strong. >> thanks. >> incredible. caitlyn nordin and steve burn. authorities say they have made significant progress in the boston terror investigation. there is a lot they are not sharing, obviously. the question is how much closer are they tonight to cracking the case or where are they on the case coming out? we'll give you the latest information that we have. [ male announcer ] alka-seltzer plus presents the cold truth. i have a cold, and i took nyquil, but i'm still "stubbed" up. [ male announcer ] truth is, nyquil doesn't unstuff your nose. what? [ male announcer ] it doesn't have a decongestant. tom, as well.